package jiu;

/**
 * Created by mc on 2016/7/29.
 */
import java.util.*;
class STudent{
    String number;
    String name;
    int score;
    STudent(String number,String name,int score){
        this.number = number;
        this.name = name;
        this.score = score;
    }
}
public class wu
{
    public static void main(String[] arges)
    {
        Set<STudent> students = new TreeSet<>();
        students.add(new STudent("B1234","Justin",90));
        students.add(new STudent("B5678","Monica",100));
        students.add(new STudent("B1234","Justin",100));
        students.add(new STudent("B5678","Monica",98));
        students.add(new STudent("B5678","Monica",100));


            System.out.println(students.size());

    }
}